www_proxy is a non-caching HTTP proxy with capability of modifying the User-Agent field. It has customizable content filterig capablity and unlike most proxy servers, it logs the contents of the body of a POST request, not just the header. This tool is handy for debugging CGI scripts, search engine submission programs, bypassing problematic routes and firewalls, and for getting rid of junk HTML content.
libtcp++ allows you to create C++ TCP/IP clients and servers without having to worry about gethostbyname, sockect, connect, bind, listen and accept. It has three classes, TcpClient , TcpServer and TcpIpRuleSet. TcpClient allows you to initiate TCP/IP connections, TcpServer is an abstract class to be used for creating servers by inheriting from it, and TcpIpRuleSet allows you to establish a set of IP-based access rules, and check IPs against them.
The Mozart system provides state-of-the-art support in two areas: open distributed computing and constraint-based inference. Mozart implements Oz, a concurrent object-oriented language with dataflow synchronization. Oz combines concurrent and distributed programming with logical constraint-based inference, making it a unique choice for developing multi-agent systems. Mozart is an ideal platform for both general-purpose distributed applications as well as for hard problems requiring sophisticated optimization and inferencing abilities.
Pidentd v3 is a much improved version of the original Ident daemon both in terms of speed, code quality and features. Features include multithreading, a "configure" script, startup autodetection, much clearer/rewritten C code, doesn't run as root after startup, has a configuration file and can be started from /etc/inittab (on systems using a SysV init).
The tcp_wrappers package allows you to monitor and filter incoming requests for the SYSTAT, FINGER, FTP, TELNET, RLOGIN, RSH, EXEC, TFTP, TALK, and other network services. It provides tiny daemon wrapper programs that can be installed without any changes to existing software or to existing configuration files. The wrappers report the name of the client host and of the requested service. The wrappers do not exchange information with the client or server applications, and impose no overhead on the actual conversation between the client and server applications.